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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Mixing in a tank stirred by a Rushton turbine at a low clearance
Chemical Engineering and Processing: Process Intensification, Volume 47, No. 5, Year 2008
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Description
Mixing efficiency in stirred tanks is an important consideration in the design of many industrial processes. Computational fluid dynamics (CFD) techniques have been employed in the present work to study the hydrodynamics in a tank stirred by a Rushton turbine. The effect of the impeller clearance on the velocity field and mixing has been investigated. It has been shown that at a low impeller clearance, the Rushton turbine generates a flow field that evolves from the typical two loops to a single loop flow pattern similar to that of an axial impeller. This single loop flow pattern resulted in an increase in axial flow and a decrease in mixing time at a constant power number. It has been found that a draft tube can be used with a single Rushton turbine, at a low clearance to aid axial flow and mixing, and this resulted in 50% reduction in mixing time. There was a good comparison between laser Doppler velocimetry (LDV) experimental and CFD simulation flow fields, both of which showed that the draft tube improved mixing in the tank by suppressing secondary circulation loops. © 2007 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Ochieng, Aoyi
South Africa, Johannesburg
School of Chemical and Metallurgical Engineering
South Africa, Pretoria
Tshwane University of Technology
Onyango, Maurice Stephen
South Africa, Pretoria
Tshwane University of Technology
Kumar, Anil
Kenya, Eldoret
Moi University
Kiriamiti, Kirimi
Kenya, Eldoret
Moi University
Musonge, Paul
South Africa, Cape Town
University of Cape Town
Statistics
Citations: 72
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.1016/j.cep.2007.01.034
ISSN:
02552701